نتایج جستجو برای: eocene
تعداد نتایج: 4349 فیلتر نتایج به سال:
摇 A new myodont rodent is reported from the lower part of the Arshanto Formation in Nuhe鄄 tingboerhe of Nei Mongol, which represents one of the earliest and most primitive myodont rodents in Asia. The new species is characterized by several primitive features, such as M1 and M2 subequal in size, anterior cingulum( id) pronounced and having weak or no connection with the protocone and protoconid...
[1] The Eocene-Oligocene (E/O) boundary interval marks one of the largest and most rapid changes in climate during the last 50 Myr. Because of a very shallow calcium carbonate compensation depth in the Eocene, as well as the reworking of sediments and hiatuses in the boundary zone, it has also been one of the most difficult stratigraphic boundaries to study in deep water marine sections, especi...
The monocot family Aponogetonaceae (Alismatales) consists only of Aponogeton, with 57 species occurring in Africa, Madagascar, India and Sri Lanka, Southeast Asia and Australia. Earlier studies inferred a Madagascan or Australian origin for the genus. Aponogeton-like pollen is documented from the Late Cretaceous of Wyoming, the early mid-Eocene of Canada, and the late mid-Eocene of Greenland. W...
There is accumulating evidence that macroevolutionary patterns of mammal evolution during the Cenozoic follow similar trajectories on different continents. This would suggest that such patterns are strongly determined by global abiotic factors, such as climate, or by basic eco-evolutionary processes such as filling of niches by specialization. The similarity of pattern would be expected to exte...
Oxygen isotope records of planktonic foraminifera indicate that Late Eocene and Oligocene tropical sea surface temperatures were as much as 88C lower than present at a time when high latitude sea surface temperatures were higher than present. Using a numerical model which describes oxygen isotope exchange during burial and recrystallization of deep sea carbonate, the effects of diagenesis on bu...
BACKGROUND We revisit the palaeopalynological record of Loranthaceae, using pollen ornamentation to discriminate lineages and to test molecular dating estimates for the diversification of major lineages. METHODS Fossil Loranthaceae pollen from the Eocene and Oligocene are analysed and documented using scanning-electron microscopy. These fossils were associated with molecular-defined clades an...
Rapid warming at the beginning of the Eocene (the Initial Eocene Thermal Maximum, or IETM) has been associated with modest changes in floral composition, mostly shifts in the relative abundances of taxa rather than large numbers of first or last appearances. Although floral change across the Paleocene-Eocene transition has been studied in many areas, few fossils demonstrably come from the ∼200 ...
The new vespid genus and species Palaeopolistes jattioti gen. et. sp. nov. is described from the Late Eocene of Monteils (Gard, France). The new taxon has clear features of the Polistinae but its tribal assignment is uncertain.
Paolaltica eocenica new genus and new species (Coleoptera: Chrysomelidae: Galerucinae: Alticini) is described and illustrated from Upper Eocene Baltic amber. The new taxon is compared with fossil and recent flea beetle genera.
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